Mybatis三种批量插入数据的方式

mapper.xml：

<?xml version='1.0' encoding='UTF-8'?><!DOCTYPE mapper PUBLIC '-//mybatis.org//DTD Mapper 3.0//EN' 'http://mybatis.org/dtd/mybatis-3-mapper.dtd'><mapper namespace='com.buhe.demo.mapper.StudentMapper'> <insert parameterType='Student'> INSERT INTO tb_student (name, age, phone, address, class_id) VALUES (#{name},#{age},#{phone},#{address},#{classId}) </insert></mapper>

mapper接口：

public interface StudentMapper { int insert(Student student);}

测试代码：

@SpringBootTestclass DemoApplicationTests {@Resourceprivate StudentMapper studentMapper;@Testpublic void testInsert(){//数据生成List<Student> studentList = createData(100);//循环插入long start = System.currentTimeMillis();studentList.stream().forEach(student -> studentMapper.insert(student));System.out.println(System.currentTimeMillis() - start);}private List<Student> createData(int size){List<Student> studentList = new ArrayList<>();Student student;for(int i = 0; i < size; i++){student = new Student();student.setName('小王' + i);student.setAge(18);student.setClassId(1);student.setPhone('1585xxxx669');student.setAddress('未知');studentList.add(student);}return studentList;}}2. foreach标签

mapper.xml：

<?xml version='1.0' encoding='UTF-8'?><!DOCTYPE mapper PUBLIC '-//mybatis.org//DTD Mapper 3.0//EN' 'http://mybatis.org/dtd/mybatis-3-mapper.dtd'><mapper namespace='com.buhe.demo.mapper.StudentMapper'> <insert parameterType='Student'> INSERT INTO tb_student (name, age, phone, address, class_id) VALUES (#{name},#{age},#{phone},#{address},#{classId}) </insert> <insert id='insertBatch'> INSERT INTO tb_student (name, age, phone, address, class_id) VALUES <foreach collection='list' separator=',' item='item'>(#{item.name},#{item.age},#{item.phone},#{item.address},#{item.classId}) </foreach> </insert></mapper>

mapper接口：

public interface StudentMapper { int insert(Student student); int insertBatch(List<Student> studentList);}

测试代码：

@SpringBootTestclass DemoApplicationTests {@Resourceprivate StudentMapper studentMapper;@Testpublic void testInsertByForeachTag(){//数据生成List<Student> studentList = createData(100);//使用foreach标签，拼接SQL插入long start = System.currentTimeMillis();studentMapper.insertBatch(studentList);System.out.println(System.currentTimeMillis() - start);}private List<Student> createData(int size){List<Student> studentList = new ArrayList<>();Student student;for(int i = 0; i < size; i++){student = new Student();student.setName('小王' + i);student.setAge(18);student.setClassId(1);student.setPhone('1585xxxx669');student.setAddress('未知');studentList.add(student);}return studentList;}}3. 批处理

测试代码：

@SpringBootTestclass DemoApplicationTests {@Autowiredprivate SqlSessionFactory sqlSessionFactory;@Testpublic void testInsertBatch(){//数据生成List<Student> studentList = createData(100);//使用批处理long start = System.currentTimeMillis();SqlSession sqlSession = sqlSessionFactory.openSession(ExecutorType.BATCH,false);StudentMapper studentMapperNew = sqlSession.getMapper(StudentMapper.class);studentList.stream().forEach(student -> studentMapperNew.insert(student));sqlSession.commit();sqlSession.clearCache();System.out.println(System.currentTimeMillis() - start);}private List<Student> createData(int size){List<Student> studentList = new ArrayList<>();Student student;for(int i = 0; i < size; i++){student = new Student();student.setName('小王' + i);student.setAge(18);student.setClassId(1);student.setPhone('1585xxxx669');student.setAddress('未知');studentList.add(student);}return studentList;}}三种方式的对比

MySQL服务器版本：5.6.4

其他依赖版本如下：

<?xml version='1.0' encoding='UTF-8'?><project xmlns='http://maven.apache.org/POM/4.0.0' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'xsi:schemaLocation='http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd'><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.4.4</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.buhe</groupId><artifactId>demo</artifactId><version>0.0.1-SNAPSHOT</version><name>demo</name><description>Demo project for Spring Boot</description><properties><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.41</version></dependency><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>1.3.1</version></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins><resources><resource><directory>src/main/java</directory><includes><include>**/*.xml</include></includes></resource></resources></build></project>

三种插入方式在不同数据量下的表现，测试结果：

插入方式 10条 100条 500条 1000条 循环插入 496ms 3330ms 15584ms 33755ms foreach标签 268ms 366ms 392ms 684ms 批处理 222ms 244ms 364ms 426ms

三种方式中，批处理的方式效率是最高的，尤其是在数据量大的情况下尤为明显。

其次是foreach标签，foreach标签是通过拼接SQL语句的方式完成批量操作的。但是当拼接的SQL过多，导致SQL大小超过了MySQL服务器中max_allowed_packet变量的值时，会导致操作失败，抛出PacketTooBigException异常。

最后是循环插入的方式，这种方式在数据量小的时候可以使用，在数据量大的情况下效率要低很多。

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